1 /*
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 package org.apache.hadoop.hbase.replication;
20
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22
23 import java.util.List;
24
25 /**
26 * This is the interface for a Replication Tracker. A replication tracker provides the facility to
27 * subscribe and track events that reflect a change in replication state. These events are used by
28 * the ReplicationSourceManager to coordinate replication tasks such as addition/deletion of queues
29 * and queue failover. These events are defined in the ReplicationListener interface. If a class
30 * would like to listen to replication events it must implement the ReplicationListener interface
31 * and register itself with a Replication Tracker.
32 */
33 @InterfaceAudience.Private
34 public interface ReplicationTracker {
35
36 /**
37 * Register a replication listener to receive replication events.
38 * @param listener
39 */
40 public void registerListener(ReplicationListener listener);
41
42 public void removeListener(ReplicationListener listener);
43
44 /**
45 * Returns a list of other live region servers in the cluster.
46 * @return List of region servers.
47 */
48 public List<String> getListOfRegionServers();
49 }